It's here: https://meta.wikimedia.org/wiki/CentralNotice/Travel_Guide
Not too easy to find at the moment. Don't know when it was announced, but it already has a fair number of translations.

2012/7/23 Eleri James <elerijms@yahoo.co.uk>
Where can we translate the central notice that has just appeared regarding the proposed WMF travel guide?

Eleri James




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